While Dental Bridges can last a lifetime, they do sometimes come loose or fall out. The most important step you can take to ensure the longevity of your bridge is to practice good oral hygiene. your dental bridge can lose it's support if the teeth or bone holding it in place are damaged by dental disease. Keep your gums and teeth healthy by brushing with fluoride toothpaste twice a day and flossing daily. Also, see your dentist for regular check-ups and professional cleaning.